{\smallskip}
. 
. xtreg emp wells i.year, fe
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Fixed-effects (within) regression               Number of obs      =      2794
Group variable: county                          Number of groups   =       254
{\smallskip}
R-sq:  within  = 0.0600                         Obs per group: min =        11
       between = 0.0230                                        avg =      11.0
       overall = 0.0061                                        max =        11
{\smallskip}
                                                F(11,2529)         =     14.67
corr(u_i, Xb)  = 0.0653                         Prob > F           =    0.0000
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\HLI{13}{\TOPT}\HLI{64}
         emp {\VBAR}      Coef.   Std. Err.      t    P>|t|     [95\% Conf. Interval]
\HLI{13}{\PLUS}\HLI{64}
       wells {\VBAR}   24.06518    4.34746     5.54   0.000     15.54024    32.59012
             {\VBAR}
        year {\VBAR}
       2002  {\VBAR}  -373.1921   700.1841    -0.53   0.594    -1746.185    999.8006
       2003  {\VBAR}   -627.678   700.3072    -0.90   0.370    -2000.912    745.5562
       2004  {\VBAR}  -240.9629   700.4522    -0.34   0.731    -1614.481    1132.556
       2005  {\VBAR}   642.3055   700.7512     0.92   0.359    -731.7992     2016.41
       2006  {\VBAR}    1841.01   701.6549     2.62   0.009     465.1332    3216.887
       2007  {\VBAR}   2879.084   704.0376     4.09   0.000     1498.535    4259.633
       2008  {\VBAR}   3594.051   705.5188     5.09   0.000     2210.597    4977.504
       2009  {\VBAR}   2581.419   702.0033     3.68   0.000     1204.859    3957.979
       2010  {\VBAR}    2569.52   703.4582     3.65   0.000     1190.107    3948.933
       2011  {\VBAR}   3373.796   705.4746     4.78   0.000     1990.429    4757.163
             {\VBAR}
       _cons {\VBAR}   36484.29   495.0877    73.69   0.000     35513.47    37455.11
\HLI{13}{\PLUS}\HLI{64}
     sigma_u {\VBAR}  168602.82
     sigma_e {\VBAR}  7890.1816
         rho {\VBAR}  .99781478   (fraction of variance due to u_i)
\HLI{13}{\BOTT}\HLI{64}
F test that all u_i=0:     F(253, 2529) =  4961.84           Prob > F = 0.0000
{\smallskip}
. 
